Confused about recording and rendering sizes for You tube ----HELP!!!!!

Hi I am relatively new to using Camtasia and although I have looked at countless videos and advice, I cannot fathom this out. I am trying to record a video for production in YouTube.

It seems that the best size is 1080x720 as I am,recording an application and the lettering comes out blurred with any other setting but it I set the area size to this then I loose half the screen (see screen print below).

If I stretch the window to the size of the monitor then it it changes the dimensions to 1667x886

But then when I try to render the video in 1080 x 720 I loose the top and bottom of the screen in the playback

Can someone PLEASE help

BTW this is the the settings that I recorded at to get the recording to fit my screen

Thanks both for all your help - @Ed I am sorry if I ma being completely dumb here what I dont understand if I try to record at 2160p: 3840x21601440p: 2560x14401080p: 1920x1080720p: 1280x720480p: 854x480360p: 640x360240p: 426x240

none of these actually fit my screen (although I have discovered that 1920 x 1080 fit my laptop screen - is my problem to do with the monitor that I am trying to record on? If I select the 1080p setting then it goes over the monitor size onto my second dual monitor. If I select the 720p setting then it too small for the monitor - am I missing a point here?

All these monitor options and screen sizes can be confusing and you have to test what works best.

You could in the recorder use the Full Screen recording size and then scale the recording up or down to fit the canvas in the editor be it 1920 x 1080 or 1280 x 720. You just have to see how it looks.

A best practice is to try and record, edit, render at the same size for the best results but that's not mandatory.

For instance if I'll be zooming in a lot on a video I will record at full screen (for me that 1920 x 1080) but will edit and render at 720 (1280 x 720). That results in the text and detail being clearer when zoomed in to.

Sometimes you have to find the sweet spot depending on the projects end result.